How many Ford GPA amphibious jeeps were manufactured?

Ford manufactured 12,778 GPA amphibious jeeps during World War II.

The Ford GPA—often nicknamed “Seep,” from “Sea Jeep”—was an amphibious military vehicle based on the Ford GPW jeep. Its official supply catalog number was G504, and production took place in the United States from 1942 to 1943. A four-cylinder engine powered the vehicle on land and drove a propeller for water travel through a power takeoff system.

The GPA was intended to carry troops and supplies from ships, across water, and onto beaches. In practice, its low freeboard made it vulnerable in choppy water, while its added weight made it less capable on land than a standard jeep. Unlike the larger DUKW amphibious truck, it was not especially successful in open-water operations, and production stopped in March 1943.

About 4,486 GPAs were supplied to U.S. allies under Lend-Lease, including 3,520 sent to the Soviet Union and 852 to the British Commonwealth. After the war, the Soviet-derived GAZ-46 MAV became one of its best-known descendants.